Juliet is on her balcony thinking about Romeo and their first kiss. She is talking about how much she loves him.
Romeo hopped over a wall because he was wondering around. He didn't know that he ended up at Juliet's house and when he saw her he was shocked.
Romeo quietly went up to Juliet and he overheard her talking about how she loved him. After a while she noticed that he was listening to her and she got scared because she didn't know that he was there.
Romeo asks Juliet to marry him tomorrow because they need to be together. Juliet isn't sure so she tells Romeo that shes gonna tell him tomorrow.